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Information processing system, control method therefor, and information processing apparatus

a control method and information processing technology, applied in the field of information processing system, can solve the problems of limited number of channels capable of transferring data without fail every prescribed cycle time, and other apparatus may not be able to allocate the necessary number of channels simultaneously

Inactive Publication Date: 2003-10-07
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, however, the number of channels capable of transferring data without fail every prescribed cycle time is limited.
If a given apparatus has been allocated channels, another apparatus may not be able to allocate a necessary number of channels simultaneously.

Method used

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  • Information processing system, control method therefor, and information processing apparatus
  • Information processing system, control method therefor, and information processing apparatus
  • Information processing system, control method therefor, and information processing apparatus

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Embodiment Construction

A preferred embodiment of the present invention will be explained with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an arrangement of a system as the embodiment.

Reference numeral 101 denotes a computer which is normally used by a user and connected to a scanning device 102 via a high-speed serial communication I / F cable 105 and to a printing device 103 via a high-speed serial communication I / F cable 106. If necessary, the computer 101 is connected to another device (not shown) via a high-speed serial communication I / F cable 104, whereas the printing device 103 is connected to still another device (not shown) via a high-speed serial communication I / F cable 107.

The printing device 103 has a printing function. In printing a document or image created by the computer 101, the printing device 103 receives image printing data from the computer 101 via the high-speed serial communication I / F cables 105 and 106, performs necessary image processing, and then prints...

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PUM

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Abstract

An information processing system, which has a computer, scanning apparatus, and printing apparatus using an IEEE 1394 bus as a communication interface, searches for an available channel in order to assign a predetermined number of channels to an apparatus having operation priority. When no available channel is found by the search, the system determines whether any of channels allocated by an other apparatus can be reassigned to the high-priority apparatus. If any channels are determined to be reassignable, the system reassigns the channels to the high-priority apparatus. This makes it possible to flexibly assign channels in an isochronous transfer serial bus and transfer information desired by the user.

Description

1. Field of the InventionThe present invention relates to an information processing system including an isochronous transfer serial bus capable of transmitting a plurality of types of packets discriminated by channels, and at least two information processing apparatuses each of which uses the isochronous transfer serial bus as a communication interface and can receive packets of channels assigned to itself, a control method for the information processing system, and an information processing apparatus.2. Description of the Related ArtRecently, high-speed serial communication interfaces having a function of ensuring a given data transfer rate using a transfer mode such as an isochronous transfer mode (to be referred to as an Iso transfer mode), are receiving a great deal of attention as isochronous transfer serial buses. Known examples of such interface having the Iso transfer mode to transfer data in real time at a high speed are the USB bus and IEEE 1394 bus.In the Iso transfer mod...

Claims

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Application Information

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IPC IPC(8): G06F13/36G06F15/17G06F15/16H04L12/28H04N1/00G06F13/38G06F13/42
CPCG06F13/4282G06F13/385
Inventor YAMAGISHI, YOICHI
Owner CANON KK